how are diamond segments made?

Diamond segments, key components of diamond tools like diamond saw blades, grinding wheels, and core bits, are made through a precise process that combines cutting-edge technology with traditional materials.

 

Below is a detailed introduction to the manufacturing process of diamond segments:

Raw Material Preparation

• Diamond Particles: Based on the hardness of the material to be cut and the required cutting efficiency, appropriate diamond particles are selected. Both natural and synthetic diamonds are commonly used. The particles undergo sieving to ensure uniform size, which guarantees consistent cutting performance. The quality and concentration of diamonds directly impact the cutting speed and longevity of the segments. Higher diamond concentration generally provides better cutting performance and durability.
• Bonding Materials: Commonly used metal powders include iron, copper, cobalt, nickel, etc. The right combination of metals is selected based on different application needs. Carbides, oxides, and other reinforcing materials may also be added to enhance the bonding strength and wear resistance of the matrix.

 

Mixing and Granulation

• Mixing: Using equipment such as ball mills or mixers, diamond particles and metal powders are blended in specific proportions to ensure uniformity. This ensures that each diamond particle is adequately surrounded by the metal powder.
• Granulation: The mixed powders are granulated to form granules with good flowability and pressing characteristics. Methods include spray granulation and mechanical granulation.

 

 

Pressing and Forming

• Mold Preparation: Molds are designed according to the shape and size requirements of the segments, typically made of high-strength steel. Mold surfaces must be cleaned to prevent impurities from affecting segment quality.
• Powder Pressing: The granulated powder is placed into the mold and formed under pressure using cold pressing. Some segments use hot pressing, where the powder is pressed at high temperatures to increase density and strength.

 

Sintering Process

• Sintering Temperature Control: Equipment such as vacuum sintering furnaces or hydrogen protection sintering furnaces is used. Based on material properties, a temperature curve is developed. The temperature is gradually increased to the set point to ensure complete sintering of the diamonds and the bonding matrix.
• Sintering Procedure: During sintering, gases are removed to prevent porosity. The set temperature is maintained for a specified duration to ensure thorough bonding of diamonds and the bonding matrix, creating a dense segment structure.

 

Post-Processing

• Cutting and Trimming: The sintered segments are cut to the required size and shape. Grinding and polishing are performed to achieve smooth surfaces and precise dimensions.
• Inspection and Sorting: Visual inspection checks for defects such as cracks and pores. Dimensional inspections ensure segments meet size specifications. Hardness testing verifies compliance with required standards.

 

Assembly and Packaging

• Assembly: Diamond segments are welded onto the tool substrate (e.g., saw blade core, drill bit, or grinding wheel) using methods such as laser welding, high-frequency welding, or brazing. The assembled tool is inspected to ensure segments are securely attached without looseness.
• Packaging: Segments are packaged protectively to prevent damage during transportation. Packages are labeled with product model, specifications, and production date for easy identification and use by customers.

 

Quality Control and Certification

• Quality Control: Strict quality control is maintained at each production stage to ensure batch consistency and stability. Comprehensive inspections are conducted before products leave the factory, including checks on appearance, dimensions, hardness, and welding strength.
• Certification: ISO quality management system certification is obtained to ensure the production process meets international standards. Relevant industry certifications are also achieved as needed, such as CE certification for the construction industry.

 

 

 

In addition to the above process, there is also a production method involving mixing diamond particles, bonding agents, and other additives in a ball mill to form a uniform mixture. This mixture is then cold-pressed into segments, which are sintered in a vacuum furnace at high temperatures. After cooling, the segments undergo arc grinding, electroplating, and other treatments to produce diamond segments.

 

The production process of diamond segments involves multiple steps, each requiring precise operations and strict control. Through scientific processes and rigorous quality control, high-quality diamond segments with excellent cutting performance and durability can be produced to meet various cutting needs. Below is a summary of the key points of the production process:

• Diamond Particle Selection: The size, shape, and concentration of diamond particles influence the cutting performance and lifespan of the segments. Larger diamond particles offer faster cutting speed but may result in rougher surfaces, while smaller particles provide finer cutting but slower speed. Higher diamond concentration enhances segment lifespan and cutting efficiency but also increases costs.
• Bonding Agent Selection: The bonding agent determines the toughness and wear resistance of the segments. Different bonding agents exhibit varying degrees of compatibility with diamonds. For example, cobalt offers excellent wear resistance, copper improves heat dissipation, and iron is cost-effective. The specific application dictates the choice of bonding agent.
• Mixing and Granulation: Uniform mixing ensures even distribution of diamond particles in the bonding agent, preventing localized wear of the segments. Granulation facilitates subsequent pressing operations.
• Pressing and Forming: The choice of pressing method (cold pressing or hot pressing) affects the density and strength of the segments. Cold pressing followed by high-temperature sintering is cost-effective, while hot pressing produces denser segments with higher strength and wear resistance.
• Sintering Process: Sintering is a critical step that bonds the metal matrix and diamond particles together. Precise control of sintering temperature, time, and atmosphere is essential to prevent issues such as over-sintering or under-sintering.
• Post-Processing: Operations such as cutting, grinding, and polishing ensure the segments meet dimensional and surface quality requirements. Welding quality directly impacts the durability and safety of the tool during use.

 

 

Diamond segments can be categorized into types such as hot-pressed diamond segments, cold-pressed diamond segments, laser-welded diamond segments, and electroplated diamond segments based on their manufacturing methods. Different types of diamond segments exhibit varying performance characteristics and application ranges. For instance, hot-pressed diamond segments are known for their high density and strength, making them suitable for cutting hard materials like granite. Cold-pressed diamond segments are cost-effective and ideal for general cutting tasks. Laser-welded diamond segments feature strong bonding strength between the segments and blade core, offering high cutting efficiency and stability. Electroplated diamond segments are relatively easy to produce and cost-effective, commonly used for cutting softer materials such as marble.